Practice Test Geeks(WCL) Welding Certification Los Angeles Practice Test
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Welding Processes & Techniques Flashcards

7 cards from real WCL practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. In flux-cored arc welding (FCAW), what is the difference between FCAW-S and FCAW-G?

    Answer: FCAW-S is self-shielded; FCAW-G requires external shielding gas

    FCAW-S is self-shielded (flux in the core provides shielding), while FCAW-G requires an external shielding gas for protection.

  2. What is the correct direction of travel for SMAW to prevent slag inclusions?

    Answer: Keep the electrode angle so slag stays behind the arc, not ahead of it

    Proper electrode angle ensures slag flows behind the arc; if slag runs ahead, it becomes trapped and causes inclusions.

  3. Which AWS filler metal classification is used for mild steel GTAW (TIG) welding?

    Answer: ER70S-6

    ER70S-6 is the most common solid wire/filler rod for TIG welding mild (carbon) steel, offering good deoxidizer content.

  4. What is 'undercutting' in a weld, and what causes it?

    Answer: A groove melted into the base metal along the weld toe, caused by excessive heat or improper angle

    Undercutting is a notch melted into the base metal at the weld toe, typically caused by excessive current, improper electrode angle, or fast travel speed.

  5. For plasma arc cutting (PAC), which gas is typically used as the plasma gas for cutting carbon steel?

    Answer: Nitrogen or compressed air

    Nitrogen or compressed air is commonly used as the plasma gas for cutting carbon steel due to cost-effectiveness and clean cut quality.

  6. What is the purpose of preheating before welding high-carbon or alloy steels?

    Answer: To slow the cooling rate and reduce the risk of hydrogen cracking and hard heat-affected zones

    Preheating slows the cooling rate of the weld and HAZ, reducing hydrogen-induced cracking and preventing brittle martensite formation.

  7. Which welding position is designated '6G' and why is it significant for certification?

    Answer: Fixed 45° inclined pipe; qualifying in 6G covers all other positions

    The 6G position is a fixed pipe inclined at 45°, and a welder who qualifies in 6G is considered qualified in all positions and joint types for pipe.